Device for continuous winding of webs

ABSTRACT

Device for continuous winding of webs onto winding shafts or winding cores to winding rollers, with a pressure roller supported in a frame that can be engaged on the winding shaft or winding core. This engagement is effected with limited friction and in a sensitive manner by means of a drive, with the pressure roller being supported on at least one steering rod that is pivot-connected to two guides, the other ends of which are pivot-supported in the frame.

This is a nationalization of PCT/EP02/07272 filed Jul. 1, 2002 andpublished in German.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a device for continuous winding of webs,preferably webs made of thermoplastic synthetic material, onto windingshafts or winding cores to winding rollers, with arms supporting thewinding shaft that is preferably equipped with a drive, with a pressureroller that can be engaged on the winding shaft or winding core, or theforming winding roller, which is supported in a frame, and with a knifeseparating the web during a roller change.

2. Description of the Related Art

In winding devices of this type, the pressure roller is pressed againstthe winding core, or the forming winding roller, by means of a drivedevice in order to achieve a tightly wound winding roller without anytrapped air between the individually wound layers. Devices of thepreviously stated type are known in which the pressure roller issupported on a carriage that is equipped with a drive that moves thepressure roller and presses against the winding core, or the formingwinding roller. The carriage movable in the guides of a frame can bemoved only against substantial inevitable friction forces; even togetherwith the pressure roller supported on the same, it creates substantialmasses that must be moved during the travel of the carriage.

SUMMARY OF THE INVENTION

It is therefore the task of the invention to create a device of thepreviously stated type that enables an engagement of the pressure rollerwith the winding core, or the forming winding roller, which is low infriction.

According to the invention, this task is solved in that the pressureroller is supported on at least one steering rod, which ispivot-connected to two guides, the other ends of which arepivot-supported in the frame, and that the steering rod, or one of theguides, is equipped with a drive device.

Purposefully, the pressure roller is supported between two steeringrods, each of which is pivot-connected to two guides, the other ends ofwhich are pivot-supported in the frame.

The steering rod with two guides provided according to the inventionforms a four-joint carrying system that absorbs the weight of thepressure roller in a favorable manner. The device according to theinvention is therefore characterized in that the pressure roller issupported low in friction between steering rods of four-joint systems.In the device according to the invention, the pressure roller can beengaged sensitively with the winding core or the forming winding rollerby means of its drive device, because there are no large friction forcesthat must be overcome. Due to the fact that the pressure roller is notsupported on a carriage, the masses to be moved are reduced. Thepressure roller is moved by means of its drive in horizontal directiononly so that the influence of the mass on the contact force isnegligible.

Purposefully, the drive device consists of at least one pneumaticcylinder.

Purposefully, the pressure roller is supported in sections of thesteering rod that reach over a guide in the direction of the windingroller. An especially preferred embodiment provides that the guidesconsist of a front guide or rocker seen from the direction of thewinding core or winding roller, which is longer in length than the rearguide. If the winding roller is supported between the sections of thesteering rods reaching over the two front guides at a distance to thefront guides, the rear, shorter guides pivot the steering rods aroundthe joints at the front guides due to their smaller pivoting radius insuch a manner that a pivoting movement of the steering rod superposesthe increasing effect of the four-joint system so that the pressureroller performs a linear movement during its displacement in thedirection of the winding core or winding roller.

This approximate straight guide can be improved by the fact that theshorter rear guides, based on their pivot bearings, extend from theframe at an acute angle to the longer front guides.

A further embodiment of the invention provides that the guides aresupported on a carriage that can be moved in a frame. The carriages areequipped with a controlled drive, which moves the same once the path ofthe approximate straight guide of the system consisting of the guidesand steering rods has been depleted.

BRIEF DESCRIPTION OF THE DRAWINGS

One embodiment of the invention is explained in further detail based onthe drawing. It shows:

FIG. 1 a side view of the winding device according to the invention witha distant front side wall of the frame,

FIG. 2 the four-joint system each consisting of two guides and steeringrods for the approximate straight guide of the pressure roller as drawnfrom FIG. 1, and

FIG. 3 an exploded top view of the four-joint system consisting of twoguides and one steering rod on one side.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Further scope of applicability of the present invention will becomeapparent from the detailed description given hereinafter. However, itshould be understood that the detailed description and specificexamples, while indicating preferred embodiments of the invention, aregiven by way of illustration only, since various changes andmodifications within the spirit and scope of the invention will becomeapparent to those skilled in the art from this detailed description.

FIG. 1 shows a rear, plate-shaped side component 1, which is part of aframe. The front side component is removed in order to better view thedevices arranged between the side components.

A carriage is guided horizontally movable between the side components 1.Only the side wall 2 of the carriage is illustrated, as the front sidewall is again removed for reasons of better illustration. The side walls2 of the carriage are connected to each other by not illustratedtraverse members. The side walls 2 are guided in a movable manner inguides 3 of the side components 1 that are illustrated in broken lines.At its upper side edge, at least the side wall 2 is equipped with a gearrod 4, which engages with the pinion gear 5 of a gear motor 6, which iscontrolled by the electronic machine control for moving the carriagewith the side walls 2.

On both sides of a shaft 7 that is supported between the side walls 2,two-armed levers 8 are pivot-supported, the arms 10 of which point inthe direction of the winding core 9, which carry the charging electrode12 that expands across the width of the web 11. The interior arms 13 ofthe two-armed lever 8 are equipped with axle journals 14, on whichrollers 15 are supported, which are guided in guides 16 of the sidecomponents 1 of the frame, and which consist of slotted holes. Theguides 16 consist of a laterally extending section 17 and, connected tothe same, of a section 18 extending parallel to the guide 3.

Attached to the arms 10 of the two-armed lever 8 extending toward theexterior, are not only the electrode 12, but also a linear unit, such asa piston rod-less pneumatic cylinder, which moves a knife 19 across thewidth of the web 11 for the purpose of cutting the web 11.

On both sides of the shaft 7, front guides or rockers 20 arepivot-supported on the interior sides of the carriage side walls 2,which are pivoted by means of the pneumatic cylinder 23, the piston rods21 of which are pivot-supported on journals 22 of the rockers 20. Thecylinders 23 are pivot-supported on journals 24 of the carriage sidewalls 2.

Tension springs 25 are arranged below the pneumatic cylinders 23parallel to the same, the ends of which are suspended from journals 26of the rocker 20, and journals 27 of the side wall 2.

The rockers 20 carry axle journals 30 above the pneumatic cylinders 23,on which coupling elements 31 are supported. At their rear ends, thecoupling elements 31 are pivot-connected to rear guides 32 in the joints33, the upper ends of which are pivot-supported on axle journals 34 ofthe side walls 2. The coupling elements 31, which may be embodied assteering rods, transfer the rockers 20 in the direction of the windingcore 9. The pressure roller 38 is supported between the free ends of thecoupling elements 31.

The electrode 12 may consist of a number of needles, and is laterallyencased by rails that provide protective cover.

The arrangement of the knife 19 with the piston rod-free pneumaticcylinder on the carrier of the electrodes 12 results in a cut closelyabove the roller gap between the winding core 9 and the pressure roller38 once the knife is activated so that a web start with a short flap iscreated.

The web 11 moves in the direction of arrow A, and is fed to the pressureroller 38 by a guide roller 39, which may be supported, for example,between the side walls 2 of the carriage.

The two-armed levers 8 with electrodes 12 and knives 19, as well as theguides 16 for the rollers 15 of the interior arms of the two-armedlevers 8 are arranged laterally reversed to a midplane 140 which extendsthrough the axes of the winding core 9 and the pressure roller 38. Inthis way, a simple conversion of the winding device to winding from leftto right is possible.

FIG. 2 shows the four-joint system for the approximate straight guide ofthe pressure roller 38, consisting of the guides and the steering rod,which has been pulled out of FIG. 1 for the purpose of betterillustration. The guide forming rockers 20 on each side are attached tothe pivoting shaft 7, or clamped to the same, which are supportedbetween the side walls 2 of the carriage movable in the guides 3 of theside components 1 in the manner shown in FIG. 3. The guides 32 arepivot-supported on the axle journals 34, which are firmly connected tothe side walls 2 in the manner shown in FIG. 3. The coupling elements orsteering rods 31 are articulated in the joints 30 on the rockers 20, andin the joints 33 on the guides 32. The steering rods 31 surmount therockers 20 by sections 40 of a certain length, between which thepressure roller 38 is supported.

The guide 32 is shorter than the rocker 20 between their joints 7 and30. In the embodiment example illustrated, the guide 32 is inclined at aright angle in the direction of the rocker 20 based on its upper bearing34. The different length of the rockers 20 and of the guides 32, as wellas the distances of the joints 30 and 33 on the steering rods 31, andthe lengths of the coupling rod sections 40 between the bearings for thepressure roller 38 and the bearings 30 on the rockers 20 are coordinatedin such a manner that, during the pivoting of the steering rods betweenthe position of the pressure roller 38 illustrated in FIG. 2 as a fullline, in which the steering rods are displaced in the direction of thewinding core, and the retreated position illustrated as a semi-colonline, the movement of the pressure roller occurs approximately linear inhorizontal direction.

The rockers 20 surmount the steering rods 31 by sections 41 of a certainlength toward the bottom. For each section a bearing journal 22 isprovided below the steering rod 31, on which the piston rod 21 of thepneumatic cylinder 23 is supported, which in turn is pivot-supported onthe journal 24 that is firmly connected to the side wall 2.

Tension springs 25 are spanned below the pneumatic cylinder 23 betweenthe journals 26 of the sections 41 of the rockers 20 and the journals 27provided on the side walls 2, which serve the purpose of increasing theadjusting range of the contact force that is exerted on the rockers 20by means of the pneumatic cylinders 23.

The invention being thus described, it will be apparent that the samemay be varied in many ways. Such variations are not to be regarded as adeparture from the spirit and scope of the invention, and all suchmodifications as would be recognized by one skilled in the art areintended to be included within the scope of the following claims.

1. A device for continuous winding of webs onto winding shafts orwinding cores to winding rollers, comprising: a frame; a pressure rollerthat can be engaged with the winding shaft or winding core, or thewinding roller, respectively; front and rear guides having first endsand second ends, said first ends being pivotally supported on said frameby frame joints; at least one steering rod supporting the pressureroller and pivotally connected to said second ends of said two guides bysteering rod joints, said steering rod or one of said guides beingequipped with a drive unit to effect substantially horizontal movementof said steering rod with said pressure roller supported thereon; saidfront guide being nearest the winding roller and said rear guide beingshorter in length than the front guide and oriented at an acute anglewith respect to said front guide, said guides being pivotally movable onsaid frame and steering rod joints in response to said movement of saidsteering rod.
 2. The device according to claim 1, wherein the pressureroller is supported between at least two steering rods which are eachpivotally connected to said two guides, the other ends of said twosteering rods being pivotally supported in the frame.
 3. The deviceaccording to claim 1, wherein the drive unit includes a piston/cylinderunit.
 4. The device according to claim 1, wherein the pressure roller issupported by a section of said steering rod which extends toward thewinding roller and projects beyond the guides.
 5. The device accordingto claim 1, wherein the guides are supported on a carriage that ismovable in said frame.
 6. The device according to claim 5, wherein thecarriage is equipped with a controlled drive which moves said carriagein a substantially horizontal direction once the maximum substantiallyhorizontal movement of said steering rod has been reached.
 7. A devicefor continuous winding of a web onto a winding shaft, comprising: aframe; a pressure roller that cooperates with the winding shaft; arocker having a first end pivotally supported on said frame; a guidehorizontally spaced from said rocker and having a first end pivotallysupported on said frame, said guide being further from said windingshaft than said rocker; a coupling element having a rear end pivotallyconnected to a second end of said guide, and having a forward endpivotally connected to a second end of said rocker, said couplingelement supporting said pressure roller adjacent said forward end; and adrive unit associated with said coupling element, said rocker or saidguide for moving said coupling element and said pressure rollersupported thereon in a substantially horizontal direction, said guideand said rocker being pivotally movable on each of their respective endsin response to said coupling element movement.
 8. The device accordingto claim 7, wherein said coupling element is a steering rod.
 9. Thedevice according to claim 7, wherein the pressure roller is supportedbetween at least two coupling elements which are each pivotallyconnected to said rocker and said guide.
 10. The device according toclaim 7, wherein the drive unit includes a piston/cylinder unit.
 11. Thedevice according to claim 10, wherein said drive unit is supported atone end on said frame and is pivotally supported at an opposite end onsaid rocker.
 12. The device according to claim 7, wherein said couplingelement includes a section adjacent said forward end that extends towardsaid winding shaft and projects beyond said rocker, said pressure rollerbeing supported on said section.
 13. The device according to claim 7,wherein the rocker and the guide are supported on a carriage that ismovable in said frame.
 14. The device according to claim 13, wherein thecarriage is equipped with a controlled drive which moves said carriagein a substantially horizontal direction once the maximum substantiallyhorizontal movement of said coupling element has been reached.
 15. Thedevice according to claim 7, wherein said guide is shorter in lengththan said rocker and extends toward said rocker from said frame at anacute angle.